Unseasonable Mosquito Surge Hits Southern California in Winter
Unseasonable Mosquito Surge Hits Southern California in Winter
US · Published Feb 28, 2026
Southern California is experiencing an unseasonal surge in mosquito activity during the winter.
Recent heavy rainfall and warm temperatures have created ideal breeding conditions for mosquitoes, particularly the invasive Aedes aegypti species.
Vector control districts are implementing measures and advising residents to eliminate standing water and use mosquito repellent to prevent bites.
Winter mosquito activity spikes in Southern California
Southern California is currently grappling with an unexpected surge in mosquito activity during the winter months, a period typically characterized by minimal insect presence. Vector control districts across Los Angeles, Orange, and Ventura counties have reported a notable increase in mosquito populations, with Orange County witnessing a fivefold increase compared to the average of the past five years. This unusual phenomenon is primarily attributed to recent weather patterns, including significant rainfall and unseasonably warm temperatures, which have collectively created favorable breeding conditions for mosquitoes.
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